Suterareta Moto Seijo ga Shiawase ni naru Made: Norowareta moto Tensai Majutsu-shi-sama to no Doukyo Seikatsu wa Amaama sugite Mi ga Mochimasen!!

The easiest way to absorb as much magic as possible is to touch lips. One day, saintess powers awoke within Fatiah, an orphan. She was then adopted by a viscount who heard of her powers, but she lost her power almost immediately upon living there. Not only that, but Loretta, the daughter of the viscount, was instead able to use the saintess's power! Fatiah was now a former saintess and was kicked out of the viscount's house even though she had nowhere to go. That was when she was saved by the mysterious, handsome young man, Lionel. He's a former sorcerer who had to quit when he was cursed. Fatiah ended up living with him so she could learn how to use her magic. That's the beginning of the overly sweet life of the former saintess and the ex-sorcerer who have begun living together... (Source: BisouBisou Comics)